Hirschmann MACH 1040 Series, User Manual

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Spanning Tree
56
4.6 The Rapid Spanning Tree
Protocol
Redundancy
Release 6.0 07/2010
Meaning of the RSTP port states:
X
Disabled: port does not belong to the active topology
X Discarding: no address learning in FDB, no data traffic except BPDUs
X
Learning: address learning active (FDB), no data traffic except BPDUs
X Forwarding: address learning active (FDB), sending and receiving of all
frame types (not only BPDUs)
4.6.3 Spanning Tree Priority Vector
To assign roles to the ports, the RSTP bridges exchange configuration
information with each other. This information is known as the Spanning Tree
Priority Vector. It is part of the RST BPDUs and contains the following
information:
X Bridge identifier of the root bridge
X
Root path costs for the sending bridge
X Bridge identifier for the sending bridge
X Port identifiers of the port through which the message was sent
X
Port identifiers of the port that has received the message
STP port state Administrative
bridge port
state MAC
operational
RSTP
Port state
Active topology
(port role)
DISABLED Disabled FALSE Discarding
a
a. The dot1d MIB shows “Disabled
Excluded (disabled)
DISABLED Enabled FALSE Discarding
a
Excluded (disabled)
BLOCKING Enabled TRUE Discarding
b
b. The dot1d MIB shows “Blocked”
Excluded (alternate, backup)
LISTENING Enabled TRUE Discarding
b
Included (root, designated)
LEARNING Enabled TRUE Learning Included (root, designated)
FORWARDING Enabled TRUE Forwarding Included (root, designated)
Table 7: Relationship between port state values for STP and RSTP